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Hello!
Would you mind helping me with an important question: using articles with possessives? I see different things in different textbooks, as usually (((
For example: Michael drove his friend’s car. (There we have a demonstrative pronoun HIS before the noun in possessive case). But would these sentenses be correct as well: Michael drove the friend’s car / Michael drove a friend’s car?
I used to think that we do not use articles with possessives...
Thank you in advance for you reply!

In the sentence you cite, 'his' is a possessive adjective (it modifies 'friend'), not a demonstrative pronoun. Both of the sentences you ask about are grammatically correct, but couldn't just replace the one you asked about. If you used the first one, for example, 'the' implies that the friend hasn't been identified and 'a' implies that the friend hasn't been mentioned yet.

Thank you very much for the explanation. It is absolutely clear now.
Unfortunately, in some russian textbooks (approved by the Ministry of Education, by the way) we have information that it's impossible to use articles with possessives.
Excuse me my mistake about pronouns )))

Good Evening,
In above mentioned example ,:We are having a party at John’s house. [there is only one possessive noun with 's]
Can the sentence be written like this .
We are having a party at John's wife's house.

Yes, both of those sentences are fine. You can have multiple possessives in one sentence, though you need to be careful that the sentence does not become hard to follow. Two possessives is certainly fine, but more than that is unusual.